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judymcconville@roadrunner.com 2017-04-27 14:52:45 -07:00
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@ -118,7 +118,7 @@ image::images/mbc2_0204.png["Transaction chain"]
Different wallets may use different strategies when aggregating inputs to make a payment requested by the user. They might aggregate many small inputs, or use one that is equal to or larger than the desired payment. Unless the wallet can aggregate inputs in such a way to exactly match the desired payment plus transaction fees, the wallet will need to generate some change. This is very similar to how people handle cash. If you always use the largest bill in your pocket, you will end up with a pocket full of loose change. If you only use the loose change, you'll always have only big bills. People subconsciously find a balance between these two extremes, and bitcoin wallet developers strive to program this balance.
In summary, _transactions_ move value from _transaction inputs_ to _transaction outputs_. An input is a reference to a previous transaction's output, showing where the value is coming from. A transaction output directs a specific value to a new owner's bitcoin address and can include a change output back to the original owner. Outputs from one transaction can be used as inputs in a new transaction, thus creating a chain of ownership as the value is moved from owner to owner (see <<blockchain-mnemonic>>).
((("transactions", "defined")))In summary, _transactions_ move value from _transaction inputs_ to _transaction outputs_. An input is a reference to a previous transaction's output, showing where the value is coming from. A transaction output directs a specific value to a new owner's bitcoin address and can include a change output back to the original owner. Outputs from one transaction can be used as inputs in a new transaction, thus creating a chain of ownership as the value is moved from owner to owner (see <<blockchain-mnemonic>>).
==== Common Transaction Forms